I don't understand accounting at all and I need these blanks to be answered.

On January 1, Year 1, Poultry Processing Company purchased a freezer and related installation equipment for $68,400. The equipment had a three-year estimated life with a $5,100 salvage value. Straight-line depreciation was used. At the beginning of Year 3, Poultry Processing revised the expected life of the asset to four years rather than three years. The salvage value was revised to $4,100. Required Compute the depreciation expense for each of the four years, Year 1Year 4